Boring or penetrating the earth – Automatic control – Of advance or applied tool weight
Patent
1998-02-26
2000-01-25
Dang, Hoang
Boring or penetrating the earth
Automatic control
Of advance or applied tool weight
173 6, E21B 4400, E21B 302
Patent
active
060168781
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method and a device for drilling in rock or in earth layers with impregnated diamond drill bits, i.e. drill bits with diamonds in the bit body.
In prior art drilling devices, e.g. for exploration drilling, of the kind which the present invention intends to improve one has the problem of obtaining good drill penetration and good service life at the same time. If the feed force is too low the drill bit is polished so that it very soon loses its cutting ability. If the feed force is too high the drill bit is quickly destroyed because of overheating. The problem of the operator is to continously watch the drilling parameters and correct if the drill penetration decreases. If the drill bit starts being blunt the cutting ability can be restored through momentary increase of the feed force and/or through momentary drastic decrease of the amount of flushing fluid. Since the ability of the operator to observe decreased drill penetration is limited restoration of the cutting abillity results in a large wear of the drill bit. Furthermore the manual sharpening of the drill bit results in a great risk that the drill bit is overheated and quickly destroyed.
SUMMARY OF THE INVENTION
The present invention, which is defined in the subsequent claims, aims at achieving a drilling device where the service life of the drill bit is substantially increased at the same time as the drill penetration is a kept at a substantially constant and high level. This is achieved through sensing a number of drilling parameters and that the drilling device is automatically controlled depending on the parameters.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention is described below with reference to the accompanying drawings in which FIG. 1 shows a side view of a drilling device according to the invention. FIG. 2 shows a part of the drilling device in FIG. 1 on a larger scale. FIG. 3 shows schematically a control system comprised in the drilling device according to the invention.
DESCRIPTION OF THE BEST MODES FOR CARRYING OUT THE INVENTION
The drilling device shown in the drawings comprises a stand 1 on which a feed device 2 is arranged. The stand can be in form of a sledge as in FIG. 1 or a vehicle or another arrangement carrying the feed device in a stable manner. The feed device 2 has in the shown example been simplified so as to comprise two sprockets 11,12 and a chain 13 which passes over the sprockets and is connected with a drilling device 3 and is driven by a motor 10 which drives the sprocket 12. The feed device can be made in an arbitrary way which allows movement of the drilling unit to-and-fro along the feed device 2. A preferred feed device is shown in U.S. Pat. No. 3,613,804, where a hydraulic cylinder is used as feed motor. The drilling device comprises a rotary motor 14 which via a gear box 15 rotates a chuck 16. The drilling device has a through passage for a drill string 4. The chuck 16 comprises gripping means which can be brought into engagement with the drill string for rotation of the drill string. A holder 5 for the drill string is arranged at the lower end of the feed device 2. Cooperation between the chuck 16, holder 5, feed device 2 and the drilling device 3 can be as described in U.S. Pat. No. 3,613,804. The feed device 2 furthermore comprises a sensor 22 for measuring the position and the speed of the drilling device 3 along the feed device. This can take place in several different ways, e.g. that the position of the drilling device is measured at given times whereby position and time is used to calculate the speed. One can also directly measure the speed or use a position sensor with built-in electronics which delivers a speed signal. The drilling device 3 is provided with a revolution sensor 23 for indication of the rotational speed of the rotary motor 14 and thus also indication if rotation is there or not. Signals from the different sensors are via cables 21 transferred to a control unit 9 for controlling the drilling process
REFERENCES:
patent: 3613805 (1971-10-01), Lindstad et al.
patent: 3971449 (1976-07-01), Nylund et al.
patent: 4875530 (1989-10-01), Frink et al.
patent: 5318136 (1994-06-01), Roswell et al.
patent: 5449047 (1995-09-01), Schivley, Jr.
Atlas Copco Craelius AB
Dang Hoang
Stone Mark P.
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